Experiment: Concentrated hydrochloric acid was placed in a beaker and a glass rod dipped in ammonia was brought near.Observation: Dense white fumes were observed.Question: What is being formed?
Correct answer: B. Ammonium chloride due to combination of HCl and NH₃.
- A. Sulfuric acid vapor reacting with water.
- B. Ammonium chloride due to combination of HCl and NH₃.
- C. Ammonia decomposing in air.
- D. Precipitate of hydrogen gas.
Explanation
The correct answer is Option B: Ammonium chloride due to combination of HCl and NH₃. In the given experiment, the presence of dense white fumes indicates the formation of ammonium chloride resulting from the reaction between hydrochloric acid and ammonia. Option A is incorrect as sulfuric acid is not involved in the experiment. Option C is incorrect as ammonia is not decomposing in air. Option D is incorrect as the observation is not indicative of the formation of hydrogen gas.
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Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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